And from there you can select ' Someone posts a new entry to dohmah2' Just make sure there is a tick in the 'By Email' box and voila. Whenever anyone makes a top level post, you'll get an email message telling you it's there.

And can also use it to track individual posts, say someone on your flist has posted an interesting discussion that you'd like to follow, you can do so in the same way. Indeed, you can also track individual threads off a comment or more.